Sec. Vulnerability in Aserver (revised 02)

Sec. Vulnerability in Aserver (revised 02)

Post by Security Ale » Tue, 21 Mar 2000 04:00:00

Last Revised: 17 March, 2000

The information in the following Security Advisory should be acted upon
as soon as possible.  Hewlett-Packard Company will not be liable for any
consequences to any customer resulting from customer's failure to fully
implement instructions in this Security Advisory as soon as possible.

PROBLEM:  /opt/audio/bin/Aserver can be used to gain root access.

PLATFORM: HP9000 Series 7/800 running HP-UX releases 10.X and 11.X

DAMAGE:   Root access is possible.

SOLUTION: **REVISED 02** Change the Aserver permissions.

AVAILABILITY:  This advisory will be updated when patches are available.

CHANGE SUMMARY: This revision contains revised permission recommendations.
   A. Background
      A procedure to use /opt/audio/bin/Aserver to gain root access
      has been made public.

   B. Recommended solution
**REVISED 01**  | The need for suid permissions is being reviewed.
                | The only requirement for suid currently identified
                | is to allow any user to force a restart of the Aserver.
                | This feature may be eventually be removed.  Until a
                | patch is available the recommended solution, as root
                | is:
                |  chmod 555 /opt/audio/bin/Aserver
**REVISED 02** || Until a patch is available that fixes the problem
               || installing an Aserver patch will restore the original
               || permissions.  It is safer to set the 555 permissions
               || each time the system is started.  One way to do that
               || is to create /sbin/rc2.d/S769audio with 555 permissions
               || containing the following script:
               ||export PATH
               ||case $1 in
               ||       echo "chmod 555 /opt/audio/bin/Aserver"
               ||       ;;
               ||       chmod 555 /opt/audio/bin/Aserver
               ||       ;;
               ||       echo "usage: $0 start"
               ||       ;;
               ||exit 0

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